Silk UI SectionExpandable when does section content load

Silk UI SectionExpandable when does section content load

I am creating a page with a long list with expandable sections which are all collapsed when the page opens, Each section contains another lsit, I do not want each section's content to load when the page laods, but when it is expanded.

I cannot find confirmation that the content of each section is loaded when the page loads. Does someone know please?

If the content of each section loads even though collapsed when the page opens, then how can I prevent this please?